Test tutorials

[ElliottKasoar]

From various discussions, my current intention is to migrate the tutorials in https://github.com/stfc/janus-tutorials into this repository, making them easier to find, and test against.

Exactly how/when we test them is still open to discussion. I don't think we want to test them on every change to main, but I'm currently thinking we ought to test that they run before each tagged release is generated and published.

[alinelena]

I suggest we tested them on every tag, or manually

[ElliottKasoar]

I suggest we tested them on every tag, or manually

Yes, that's sort of what I mean.

I'm just thinking it would be nice if it's tested before the tag is "finalised".

Currently, we run publish-on-pypi on tagging. I'm suggesting that as part of that workflow, or at least as a condition, we run tests on the tutorials.

If the tests fail, we'd have to delete the tag and try again, but it means our official tagged releases on GitHub/PyPI contain working tutorials for that tag.